Without a doubt, there is no need to "cry over spilled milk" but to move forward with clear objectives.
My economic philosophy is quite simple. I set a goal that fulfills my aspirations and I go towards it until I achieve it. It doesn't matter if I could do better, if I can, I'll be where I wanted to be. From there I can mark another higher goal.
That's why goal setting is so important for me...Lets me navigate the ups and downs. But keeping my eye on the prize!